Tim Bray writes in The Door Is Ajar:
the incumbent is vulnerable, the alternatives are good and cheap. We just have to figure out how to get the alternatives in front of enough of the right people, and eventually just stand back and get out of the way.
He goes on to call for a blogger button campaign. Take a minute for the full article. It's a good read.
update: Richard Tallent responds with an 8 point plan that seems reasonable to me.